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晶体拼接技术能够克服光参量啁啾脉冲放大(OPCPA)过程中非线性晶体口径受限问题,从而有效地提高放大器的输出能力。针对晶体拼接中相位匹配角的精确控制和晶体加工误差补偿问题,提出了“独立调整+误差补偿”的OPCPA晶体拼接技术方案,研制了2×2晶体拼接调整机构及2×2能动反射镜,每块子晶体可以进行3个自由度旋转以达到初始拼接角和相位匹配的目的,纳米精度的压电致动器驱动的2×2能动反射镜对晶体加工误差进行补偿。利用透射式元件对晶体拼接系统进行了可行性和稳定性验证,取得了较好的实验结果,证明该拼接调整方案是可行的。
The crystal splicing technique can overcome the problem of limited aperture of nonlinear crystals during optical parametric chirped pulse amplification (OPCPA), so as to effectively improve the output capability of the amplifier. Aiming at the precise control of phase matching angle and the compensation of crystal machining error in crystal splicing, the OPCPA crystal splicing scheme with “independent adjustment + error compensation” is proposed. The 2 × 2 crystal splicing adjustment mechanism and 2 × 2 active reflex Mirror, each sub-crystal can be rotated 3 degrees of freedom to achieve the initial splicing angle and phase matching purposes, nano-precision piezoelectric actuator driven 2 × 2 active mirror to compensate for the error of the crystal processing. The feasibility and stability of the crystal splicing system were verified by using transmissive elements, and good experimental results were obtained. It is proved that the splicing adjustment scheme is feasible.